A vertically polarised electromagnetic wave with intensity $I_0$ is incident normally on a polarising filter. The filter’s transmission axis makes an angle of $30^\circ$ to the vertical. The wave that emerges from the first filter then falls normally on a second polarising filter. The transmission axis of this filter makes an angle of $90^\circ$ to the vertical. What is the intensity of the wave after it has passed through the second filter?
- A0
- B$0.063I_0$
- C$0.19I_0$
- D$0.56I_0$